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A Bid to Lure Wolves With a Digital Call of the Wild

Researchers who hiked last year to sites in Idaho where wolves gathered with their pups could get technological help this year.Credit
David Ausband/University of Montana

BOZEMAN, Mont. — The long, lonely howl of a wolf shatters the early morning stillness. But is it real? Beginning this June, it might be hard to tell, even for the wolves.

One of the most famous sounds in nature is going digital. Under a research project at the University of Montana in Missoula, scientists are betting that the famous call-and-response among wolves can be used to count and keep track of the animals.

Tricked by technology, scientists say, wolves will answer what amounts to a roll call triggered by a remotely placed speaker-recorder system called Howlbox. Howlbox howls, and the wolves howl back. Spectrogram technology then allows analysis that the human ear could never achieve — how many wolves have responded, and which wolves they are.

Photo

A prototype of a Howlbox, technology being developed to elicit and identify howls from wolves.Credit
J. Husseman/Idaho Fish and Game

“With audio software, we’ll be able to identify each wolf on a different frequency, so we can count wolves individually, kind of like a fingerprint,” said David Ausband, a research associate at the University of Montana Cooperative Wildlife Research Unit, where Howlbox was developed.

The devices, using off-the-shelf technology, cost about $1,300, including $300 for a solar panel. Audio recordings in the wild are nothing new, of course. Bird and amphibian researchers, in particular, have long used recordings to find or flush out critters. Howlbox’s innovations are the tools of digital analysis and programmed instructions that tell Howlbox when to howl, when to sleep because the wolves are sleeping, and how to store each day’s file on a disk.

The experiment will begin with a pilot project in which four Howlboxes will be placed in remote areas of Idaho in June. That month was chosen because it is when the packs gather with their spring-born pups in what is called a rendezvous.

Wolf pups will howl at almost anything, scientists say. But a test here in Montana in January also showed that adult wolves can also be fooled by a good sound system.

Photo

A G.P.S. collared black wolf in Idaho in July 2007.
Credit
J. Husseman/Idaho Fish and Game

Money is a driving force behind the research, much of which is being paid for by the Nez Perce Indian tribe in Idaho, which has deep cultural links to the western gray wolf.

Traditional tracking tools like radio collars and aerial surveillance were used extensively after wolves were reintroduced into Yellowstone National Park in the mid-1990s under the Federal Endangered Species Act. But federal protections will end later this month, and so too will the deep pockets needed for flyovers and catching and collaring.

A spokesman for the Nez Perce tribe, Curt Mack, said Howlbox might be a cost-efficient answer.

Another issue for Howlbox is the human response. To the uninitiated, a Howlbox-enhanced forest could sound as if wolves were everywhere — a scary proposition. Montana wildlife officials are braced for a public relations campaign if the project moves forward.

“That is something we would not do without touching base with local folks,” said Carolyn Sime, the wolf program coordinator at the Montana Department of Fish, Wildlife and Parks “They need to know that just because you hear the sound, it doesn’t necessarily mean that wild wolves are howling at their back door.”

A version of this article appears in print on , on page A11 of the New York edition with the headline: A Bid to Lure Wolves With a Digital Call of the Wild. Order Reprints|Today's Paper|Subscribe